diff --git a/frame/evm/test-vector-support/src/lib.rs b/frame/evm/test-vector-support/src/lib.rs
index bfa41719b4..4ec3fbdee1 100644
--- a/frame/evm/test-vector-support/src/lib.rs
+++ b/frame/evm/test-vector-support/src/lib.rs
@@ -113,7 +113,8 @@ impl PrecompileHandle for MockHandle {
 /// The file is expected to be in JSON format and contain an array of test vectors, where each
 /// vector can be deserialized into an "EthConsensusTest".
 pub fn test_precompile_test_vectors<P: Precompile>(filepath: &str) -> Result<(), String> {
-	let data = fs::read_to_string(filepath).expect("Failed to read blake2F.json");
+	let data =
+		fs::read_to_string(filepath).unwrap_or_else(|_| panic!("Failed to read {}", filepath));
 
 	let tests: Vec<EthConsensusTest> = serde_json::from_str(&data).expect("expected json array");
 
@@ -163,7 +164,8 @@ pub fn test_precompile_test_vectors<P: Precompile>(filepath: &str) -> Result<(),
 }
 
 pub fn test_precompile_failure_test_vectors<P: Precompile>(filepath: &str) -> Result<(), String> {
-	let data = fs::read_to_string(filepath).expect("Failed to read json file");
+	let data =
+		fs::read_to_string(filepath).unwrap_or_else(|_| panic!("Failed to read {}", filepath));
 
 	let tests: Vec<EthConsensusFailureTest> =
 		serde_json::from_str(&data).expect("expected json array");